[llvm] [CodeGen] Avoid repeated hash lookups (NFC) (PR #129821)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/129821

None

>From d08b7cae4aebe93cdc91fc8306777fa40447f335 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Tue, 4 Mar 2025 07:30:25 -0800
Subject: [PATCH] [CodeGen] Avoid repeated hash lookups (NFC)

---
 llvm/lib/CodeGen/MachineScheduler.cpp | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index 0eecceea3dd1e..5086ee8829b25 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -2032,10 +2032,11 @@ void BaseMemOpClusterMutation::clusterNeighboringMemOps(
     unsigned ClusterLength = 2;
     unsigned CurrentClusterBytes = MemOpa.Width.getValue().getKnownMinValue() +
                                    MemOpb.Width.getValue().getKnownMinValue();
-    if (SUnit2ClusterInfo.count(MemOpa.SU->NodeNum)) {
-      ClusterLength = SUnit2ClusterInfo[MemOpa.SU->NodeNum].first + 1;
-      CurrentClusterBytes = SUnit2ClusterInfo[MemOpa.SU->NodeNum].second +
-                            MemOpb.Width.getValue().getKnownMinValue();
+    auto It = SUnit2ClusterInfo.find(MemOpa.SU->NodeNum);
+    if (It != SUnit2ClusterInfo.end()) {
+      const auto &[Len, Bytes] = It->second;
+      ClusterLength = Len + 1;
+      CurrentClusterBytes = Bytes + MemOpb.Width.getValue().getKnownMinValue();
     }
 
     if (!TII->shouldClusterMemOps(MemOpa.BaseOps, MemOpa.Offset,